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No cabin heat 700 1991

posted by  rstarkie on  Wed Nov 20 17:27 CST 2024
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last visit: Fri Oct 24 10:14 CST 2014
[RELATED]

1991 or 92 745

I am trying to help a friend who purchased this wagon from me several years ago. He is reporting that there is no heat in the interior of the car. The heater valve is new and responding to adjustment at the dash. He flushed the heater core and it was not restricted. At this point I am wondering if the vacuum operated doors in the system might be at fault?

Where is the vacuum routed through the firewall to the dash?

Any suggestions on additional things to look for?

Thanks for any help.
--
Any twenty minute job is just a broken bolt away from a three day ordeal








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    No cabin heat 700 1991

    posted by  james_a_sousa on  Sun Dec 22 15:00 CST 2024
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    last visit: Thu Oct 23 18:51 CST 2014
    [RELATED]

    Is the defroster on?

    In my '90 744 TI, the control in the dash cracked, leaking vacuum, causing the system to default to defrost.

    I was actually able to repair the crack with plastic glue and restore proper operation.

    Always check the FAQ, even on later cars, some of the systems work the same on all Volvos.








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      No cabin heat 700 1991

      posted by  rstarkie on  Sun Dec 22 16:28 CST 2024
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      last visit: Fri Oct 24 10:14 CST 2014
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      Thanks James, I will forward this information to him. I believe he still has the car but hasn’t been driving it in the extremely cold days.
      --
      Any twenty minute job is just a broken bolt away from a three day ordeal








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    No cabin heat 700 1991

    posted by  Chris Mullet on  Fri Nov 22 13:05 CST 2024
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    last visit: Fri Oct 24 09:08 CST 2014
    [RELATED]

    If the vacuum operated heater valve is responding to commands from the control panel then you must have vacuum at the control panel. You may have an issue with leaky blend door servos not pulling the door(s) open or shut. I believe the 700/900 FAQ section has a write-up on checking and replacing a servo in the heat/AC section.








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      No cabin heat 700 1991

      posted by  rstarkie on  Thu Nov 28 08:35 CST 2024
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      last visit: Fri Oct 24 10:14 CST 2014
      [RELATED]

      Thanks Chris, I believe you are correct. It would appear that the actuator has died. He has been looking for a replacement vehicle for over a year. This component failure has pushed him into a V70.

      Randy
      --
      Any twenty minute job is just a broken bolt away from a three day ordeal







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